Quarterly report pursuant to Section 13 or 15(d)

Loans - Summary of Interest Foregone on Impaired Loans (Detail)

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Loans - Summary of Interest Foregone on Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Receivables [Abstract]        
Interest income that would have been recognized had impaired loans performed in accordance with their original terms $ 1,057 $ 1,505 $ 2,125 $ 2,933
Less: Interest income recognized on impaired loans (926) (1,239) (1,822) (2,345)
Interest foregone on impaired loans $ 131 $ 266 $ 303 $ 588